I had a lot of fun playing this. The time travel idea is great. It makes an interesting game mechanic for puzzles and perfectly fits the theme of the jam. There is a lot of potential here. I hope you continue to work on your game. I would love to play more time based puzzles.
Letting the bosses difficulty scale with the usage of the time travel mechanic is a clever idea. I had to do a second run because I just couldn't beat him with one heart. Furthermore I wanted to see what's in the laboratory. I was a little disappointed there wasn't anything to do, like a special item or easter egg. Or did I miss something?
It's impressive that you've managed to make an English and French version in only seven days.
Overall an entertaining entry. Keep up the good work.