Thanks a lot for trying out my game :)
Completely agree that its a bit simple for engagement at the moment! Will be adding a bunch of upgrades, modes and enemy types in the future to add a bit of spice.
I am curious though, what made you feel like the difficulty curve was too slow? What would make it more difficult and engaging from your perspective and taste? (fishing for ideas hehe)
I want to have it fixed by the next patch especially since I'll be working on the wave system *^*