Also create some achievements which give the money as a reward. (Ate 50 creatures, get $200 trophy) And player should start at the beginning of a level when they lose rather than starting the whole game over. Looking forward to your next games!
Change the/add a storyline, make different music, have some upgrades, maybe some money floating around to collect, and the end of each level, you can spend the money on upgrades. Also, kitten shaped amoeba get boring after a while.
12 Hundred, this is why you have to waste no time. Keep your finger on the arrow keys and run in any direction your instinct tells you to, even before the spikes are lifted.