I was literally just standing still for like the last 15 minutes. I wish the game had a fast-forward button. Any meaningful gameplay was basically over by the end of the first stage; I was worried that the game would just go on forever. Some kind of timer indicating when the next boss will appear or something might have been useful, apart from the obvious balance issues.
Not that the game was super engaging before I reach critical amount of lifeleech: I just walked around in circles, but I at least had upgrades to look forward to. Still pretty solid for a jam game, it felt complete: no gameplay systems felt tacked on or half-baked. Just some numbers that needed tweaking and maybe some enemies that don't just literally walk towards you.