That is really odd. You should be able to press F to enter the mecha. As long as you are close enough. Thanks for trying it out anyways =D
Ok I was able to get it working this time! The gun looked almost like it was just a 2D sprite, I would expect some width in it. Initially I was trying to shoot from the start point and having trouble with the projectile hitting the bottom edge of the gap to the target room. Once I realised I could get in there, I took out the targets quickly but nothing else happened, was it supposed to trigger a game over or round over or something? The jumping was a little off (floaty) for me and I was getting caught on some colliders, like stairs. But the mech looked nice and so did the targets and target room, I also enjoyed the music. Good work on your entry!