Love the game, just a few suggestions.
1."Strange Gloop", "Aberrant Matter", etc... should have a name tag of sorts. I've lost a few of them because I didn't realize witch one it was in time.
2.I can understand dying when HP runs out but the Fuel Can at least should be automatically used when out of gas, perhaps with less efficiency. I mean your car doesn't explode when you run out, your simply stuck.
3.How about a hint/help page? Nothing fancy, just some info on you items/special resources/etc.
4.To counter the vibration problems, how about "A Dulled Drills" upgrade? By sacrificing fuel you'd cause vibration 1 square around you. And if you bind it in some different button it wouldn't cause any hassle during normal play.
Quite nice, I liked it 4/5. a few thing for your "To Do" - list: 1. Activable Power-ups, I'd spent 1 out of 3 shotguns shooting the skies because of no monsters around. 2. Ammo counter/Timer, just to see how much I have left. 3. Character Screen. I was too focused on not dying to know most of the lvl-up bonuses+ a good place to put personal best attempts
er...not much sound in the game, if you want i'll add one