I find the game amusing and each of the three modes are nicely done, although with Survival it's quite annoying at the start before upgrading stats because a few of the pokemon finally peaked just as one heart finished emptying. Other than that great game

Simple, but effective.

Over-loud bangs as shots are fired prevent effective hearing of sounds.
Shooting Pokemon degrades the series as no guns are in frequent use if at all.
Unvarying Pokemon degrades the game as repeated shots on repeated Pokemon makes this game fall flat.

Nice game but I think you should hide the mouse arrow, shouldn't you?
If you're using AS2 place this in your first frame

onEnterFrame = function() {
Mouse.hide();
trace("I won't repeat such silly mistakes again"); //Well this line is optional :D
}

Then test it and it should be gone ;)