I love this game! It's a lot of fun, it can be tough sometimes, but that just adds to the game. If a game isn't tough their's no point in playing the thing.
You should have an option to stop the movement of the spikes, the game is really slow even when it's on the lowest of all settings. I have a decent computer too.
Other than that, I love the game.
It's a good game, but still needs a lot of work. Add a pause button, the length of the waves are fine ONLY and I mean ONLY if you put a restart right before the boss. When I die at the boss, it is VERY irritating to have to go through the entire wave again.
Some of the crappiest controls I've ever seen. Idea is good though. Fix it up and I might enjoy playing the game.
On a side note, just to clear any possible stereotype, I'm Catholic and I"m thoroughly NOT offended by this game.... I just wish the stupid controls were better =_=