diff --git a/app/src/lib/runtime/runtime-executor.ts b/app/src/lib/runtime/runtime-executor.ts
index ceec173..5f89476 100644
--- a/app/src/lib/runtime/runtime-executor.ts
+++ b/app/src/lib/runtime/runtime-executor.ts
@@ -82,14 +82,14 @@ export type Pointer = {
 
   perf?: PerformanceStore;
 
-   constructor(
-     private readonly registry: NodeRegistry,
-     public cache?: SyncCache<Int32Array>
-   ) {
-     this.cache = undefined;
-     this.refreshView();
-     log.info('MemoryRuntimeExecutor initialized');
-   }
+  constructor(
+    private readonly registry: NodeRegistry,
+    public cache?: SyncCache<Int32Array>
+  ) {
+    this.cache = undefined;
+    this.refreshView();
+    log.info('MemoryRuntimeExecutor initialized');
+  }
 
   private refreshView(): void {
     this.memoryView = new Int32Array(this.memory.buffer);
diff --git a/packages/macros/src/lib.rs b/packages/macros/src/lib.rs
index 838adb7..57cb551 100644
--- a/packages/macros/src/lib.rs
+++ b/packages/macros/src/lib.rs
@@ -125,7 +125,7 @@ pub fn nodarium_execute(_attr: TokenStream, item: TokenStream) -> TokenStream {
             unsafe {
                 let src = result.as_ptr() as *const u8;
                 let dst = output_pos as *mut u8;
-                // nodarium_utils::log!("writing output_pos={:?} src={:?} len_bytes={:?}", output_pos, src, len_bytes);
+                nodarium_utils::log!("writing output_pos={:?} src={:?} len_bytes={:?}", output_pos, src, len_bytes);
                 dst.copy_from_nonoverlapping(src, len_bytes);
             }
 
diff --git a/packages/utils/src/allocator.rs b/packages/utils/src/allocator.rs
index 8a7fa7a..5564929 100644
--- a/packages/utils/src/allocator.rs
+++ b/packages/utils/src/allocator.rs
@@ -9,52 +9,52 @@ extern "C" {
 #[allow(dead_code)]
 const WASM_PAGE_SIZE: usize = 64 * 1024;
 
-pub struct DownwardBumpAllocator {
-    heap_top: AtomicUsize,
+pub struct UpwardBumpAllocator {
+    heap_base: AtomicUsize,
 }
 
-impl Default for DownwardBumpAllocator {
+impl Default for UpwardBumpAllocator {
     fn default() -> Self {
         Self::new()
     }
 }
 
-impl DownwardBumpAllocator {
+impl UpwardBumpAllocator {
     pub const fn new() -> Self {
         Self {
-            heap_top: AtomicUsize::new(0),
+            heap_base: AtomicUsize::new(0),
         }
     }
 
     #[allow(dead_code)]
     pub fn init(&self) {
-        let pages = unsafe { __wasm_memory_size() };
-        let mem_size = pages * WASM_PAGE_SIZE;
-        self.heap_top.store(mem_size, Ordering::Relaxed);
+        // Start heap at 10000 to leave space for data sections
+        self.heap_base.store(10000, Ordering::Relaxed);
     }
 }
 
 #[global_allocator]
-pub static ALLOCATOR: DownwardBumpAllocator = DownwardBumpAllocator::new();
+pub static ALLOCATOR: UpwardBumpAllocator = UpwardBumpAllocator::new();
 
-unsafe impl GlobalAlloc for DownwardBumpAllocator {
+unsafe impl GlobalAlloc for UpwardBumpAllocator {
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
         let align = layout.align();
         let size = layout.size();
 
-        let mut current = self.heap_top.load(Ordering::Relaxed);
+        let mut current = self.heap_base.load(Ordering::Relaxed);
 
         loop {
-            let aligned = (current - size) & !(align - 1);
+            let aligned = (current + align - 1) & !(align - 1);
+            let new_current = aligned + size;
 
             let manual_end = unsafe { __nodarium_manual_end() };
-            if aligned < manual_end {
+            if new_current > manual_end {
                 return core::ptr::null_mut();
             }
 
-            match self.heap_top.compare_exchange(
+            match self.heap_base.compare_exchange(
                 current,
-                aligned,
+                new_current,
                 Ordering::SeqCst,
                 Ordering::Relaxed,
             ) {
diff --git a/packages/utils/src/encoding.rs b/packages/utils/src/encoding.rs
index 277c50a..70adb42 100644
--- a/packages/utils/src/encoding.rs
+++ b/packages/utils/src/encoding.rs
@@ -31,6 +31,7 @@ pub fn read_f32(ptr: i32) -> f32 {
 
 #[inline]
 pub fn read_i32_slice(range: (i32, i32)) -> Vec<i32> {
+    log!("read_i32_slice ptr: {:?}", range);
     let (start, end) = range;
     assert!(end >= start);
     let byte_len = (end - start) as usize;