This is a lot of fun, but needs to be harder! I've been playing over half an hour, and have made tons of combos, even 8's. Doesn't seem like I'll ever die.

Yeah, I agree. Since I had limited time to make the game, I had to quickly change the main challenge of the game at (somewhat literally) the last minute. I didn't have much time to test it for difficulty. Before, the plan was that the creatures would attack you, but I couldn't implement it in time. Maybe I'll add that in now that I have some time. Otherwise, I'm glad you thought it was fun!
(Also, little tip, you can even get above combos of 8's, but you'd have to work quickly and have creatures floating around nearby)