WARNING: This is one of those roguelites where you lose all progress on death. It wasn't made obvious to me so I tried restarting the level by quickly dying because I messed up a few placements and my run ended.
The gameplay is great and I reccommend it but I feel like this kind of game might be a little too slow for hard resets like this, it has about the same pace as plants vs zombie, and I feel like it would just be awful in that game to hard reset everytime you lose. I spent about 30 minutes beating 4 levels I think to get 4 new units before my run ended. But that's just my opinions on first playthrough.