I enjoyed the beginning stages of the game but it definitely needed some kind of ending, as once the upgrades kind of dried up it became less interesting. I do think that the projectile system is fun to use in this game as it starts out pretty hard to use (with e.g. the front facing projectile being somewhat awkward) and then gets more and power powerful over time as you unlock more upgrades. I thought that the upgrade menu itself timing out was clever in that it let you get through it without spending a click -- I think this could be a fun mechanic to play with if you started out with fewer clicks (and maybe had more ways to gain them), although I suppose that would also be quite punishing in the usual bullet heaven format with increasingly harder experience requirements.