this game is really a prototype for the gameplay, we are sort of working on a XNA version, with a proper artist.
I never spent a lot of time on thse, it's really about the gameplay. I'm sorry about the colors, I've also noticed that for colorblind people it is hard to see the difference between objects because the size is so similar. This will all be fixed in the final version.
about the levels: there are only 2 good ones, I should've removed the tests from the demo. The normal green level gives the best and most basic gameplay.
about the weapons: a lot of the weapons are harder to use, to add more stuff to master later on, eventually the gameplay really smooths out when you've learned what to do.
to fix this problem for beginning players however I'm planning unlocks, you simply won't start with the hard weapons, playing well will reward you with them, letting you learn to use everything slowly.
thanks again for the good feedback!