itch.io

Multiplayer would be fun, but I can see the difficulties that that would introduce.

Making it an app would be convenient, maybe to be played on a phone, or something to run on desktop.

Touchscreen support would also be nice.

This needs a few more towers and enemies, like shown in the rebirth tabs.

It looks like a ghost monster or flying monster or something, and a helicopter tower. It would have to be incredibly expensive, but it would add more to an already great game.