Very much enjoyed the first two. This one feels like a bit too much rolled into this one. You could've capitalized by splitting this into multiple games, and probably should've. Also a bit too easy overall. Nice music to go for everything though: definitely needed, since it takes a good couple hours or so.
Wish I'd known the # hotkeys sooner. Thought there was just the Spacebar drop. Don't remember it mentioning those in game.
Oh, and I know this is ages old, but there is the count error: game doesn't count special weapons in multiples of 10 on screen. It remembers where you are (10, 20, 30, etc) just fine and shows other numbers perfectly (11-19, 21-29, etc), it just skips that. Just something to not overlook on other games.
And yeah, real Endless is a perk, but it never seems to get any tougher. Kind of a bugger.