Good:
- Wilhelm scream. Made me laugh.
- I like the wackiness of it. Minecarts full of cheese, flying with an umbrella, a bubble transportation network. All very entertaining.
- I really enjoyed some of the level design. The laser beam puzzles were great.
Bad:
- I cannot for the life of me beat the big flying mouse, and it respawns me in the same room, so I can't go look for power ups.
- Speaking of said mouse, more/any telegraphing would help. There's no indication when it's going to shoot, and when it's going to charge and trap me in a corner.
- I'm not sure requiring the player to mash the shoot button is a good idea. It's very hard to do on a gamepad, annoyingly noisy on a keyboard, and excludes quite a lot of people with disabilities. I recommend limiting the fire-rate, reducing the enemy HP, and maybe making the rifle fire a burst of shots if you want to emphasize that it's rapid fire.
Overall, I loved the start, and I wish I could get to the rest of the game. I suck at boss fights in general, and this one was particularly tough for me. I gave you a good rating, because I don't think the fact that I hate that dang mouse should reflect on the game as a whole, which I really enjoyed.