I quite enjoyed the game, though I consider it quite clunky with it main gimmick. It felt that you had to hold the ray on things too long, and while you have just enough time to use it again, it felt unreliable at times. The last section is a great example of that. And the platforms too, half the time it felt it wasn't working.
I wish there were more creative uses of it, but for the limited time you guys did quite well. I would love to see this concept expanded up and refined.
Jumping was consistent for the most part, but one or two situations the jump felt a little too short, especially in the "tower". I think that however is more bad level design rather than the mechanic itself being a problem.
And, uh, is there an ending for the game? I feel like there should be but I found everything and even went back to the machine but nothing happened.
The art was solid though, as an animator myself I can appreciate the feeling of character and the time gun itself added to that. Making enemies turn to skeletons or eggs is really fun. The music was as well, having a strong intensity to it.
For a Gamejam you did a pretty damn good job. I participated in a GameJam quite recently myself (as character artist), and while I completed all the character, enemy and boss art, the game ended up a real mess due to the time limit, poor coders. So I know how intense it can be.
Great job.