fun game
but i do have a few complaints/improvements..
first, i think that a 'piercing' upgrade should be possible, (i.e 10% chance to pierce on first upgrade, 20%, 30%, 40%, 50%).. this would reduce the slightly frustrating effect of some monsters always jumping in front of another by being faster, and constantly kiting groups of monsters in circles
second, you were actually able to upgrade past 5 dots, but you only showed 5 dots.. this was misleading, i was a little confused about this
third, what's the difference between, say, the ice arrow and fire? from reading the description, i'm assuming there is no difference.. if this is true, why make one double the price of the other? this seems really silly to me.. it would've been cool if you actually incorporated elemental damage into the game, like ice arrows slowing enemies for a few seconds, fire causing splash damage, and electric arrows either jumping to multiple targets or imbuing the enemy u hit with electric charge, causing some kind of effect.. if you were to do this, maybe you could also create arrow upgrades so one could specialize in an element
while this game is a fairly simple upgrading game, it's still entertaining and has potential to be amazing