to clarify: 4/5 because the game is nice to play - well thought through - not bad on the controls (although can be improved) - and filling in a unique gap for single player flash games: but that -1 from the 5 means no replay value.
a would-be-nice-game that is unplayable. nothing so 1/5 as this. no limit on resets, no buggy monsters (or at least if they were meant to be walking off the path, then not more when playing fast forward), stats of monsters and towers would be the minimal requirement for 2/5. especially annoying when the basic idea is good....
very nice game, excellent atmosphere, i especially enjoyed that there's whole world behind the game's story. a save feature would be a good-to-have, wasd for walking a must. 5/5.