Thank you for playing my game! I am really happy you liked it :D

Yes the thing with the upgrades, I noticed it right after the jam ended, it is already fixed, however I will publish it after the rating period is over and also after the game is successfully released to G Play Store :)

I think it does, the theme was time travel and you could interprete it in any way you wanted. Since the levels go from sunlight to electric lamps, you kind of travel through time + if you finish any level, you receive a badge which appears on the home screen - when you click on it you can read a text about that kind of a light source.

Thank you for playing and rating my game, I am happy you liked it :)