1. Fixing audio bug: Once the game is fully loaded, the audio loads up to an extent. New audios aren't loaded.
2. Better cache management: Remove head/body/shield image files once a certain time is reached to save disk space. Last accessed date can be used to monitor this.
3. Better handling of graphics: The ability to downgrade images and animations' quality so better performance is achieved on low-end phones.
4. Ability to purchase gralats via paypal gateway: Gralat purchases redirect to browser and payments to be handled by paypal.
If you have more ideas feel free to drop them in this thread.