The game felt great. One of the few games made on this game engine that worked for me. But I couldn't get past the beginning of the first level due to invisible obstacles. I tried many times to shoot the invisible obstacles to see them but even then i didn't have enough time to transverse around the invisible objects to see how big they were. And there are so many of them that I would be going around one and die on another one that i wasn't awear of. Honestly it's to much to be dodging bullets, dodging enemies, killing enemies, getting powerups, all while thinking about invisible objects that you can't tell how close you are to them.
Unfortunately... the invisible obstacles made the game unplayable for me.