Thanks! Your feeling the "difference in ability" comment is pretty funny to us, cause one of the previous players/commenters expressed the opposite. So if we expand on the game we definitely need more playtesters to work that out xD I also think having more levels is some great feedback. We did initially want to have broken-down cars that could be throughout the current level so that there are some things the player needs to move around. But that'd be more spice to the already existing level rather than an additional one. But thanks again for the great feedback!
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Oh that's really funny! I will qualify and say that I think I got up to 4 brain power, and I noticed the difference around 3. Once I got there, I could feel the difference, but I figured that out on the second or third playthrough, as I died rather quickly while still getting a feel for the game and wanting to see what the difference in weapons was. So initially, I wasn't sure what the brain power effected until I found my groove in the game, and then it was more apparent. So maybe the difference across players lies in that, and the effect of the brain power needs more noticeable gradient in effectiveness.
Obstacles would be a great level design feature! Hadn't thought of that.