Amazing game! I love how you animate background tiles by flipping pattern tables. Although I encountered a bug, I think. I am using FCEUX emulator and I left game unattended to make some coffee and when I came back to it after some time all background was haywire like static on a bad TV. I tried to reproduce it, but on first four levels it did not happened, but in level 5 of Sunshine Tower (where cannons first appear) if you leave game for 15 or so minutes untouched it goes bad.