I didn't mind having to click all the time, once I realized that I needed to be hitting it fast, then I got the platforming down (though, for accessibility reasons, you may consider using OnKey/Button instead of something like OnKey/ButtonDown -- you can still keep the stepping movement, but let holding a key down allow the player to advance at a set rate of steps -- this allows you to still have quick button mashing, but also make the game playable by folks who find button mashing challenging).
What I did mind was the following bug: shooting green robots takes you back to the beginning of the game. This is absolutely too punishing. I quit playing at the level where you have to dance around all the green guys up the tower and then down those stairs -- I was sent back to the beginning twice from that level.
It's a shame, because I think there's a lot of potential to make a really cool platformer with an interesting story. I would definitely like to see a polished version of this game where there is a power progression: start with just your jump and side to side movement for a couple levels, then give players the laser, then give them the ability to shoot backwards, then give them a rechargeable jet pack they can use to boost in mid air.
I know time constraints are rough, and you did really well considering this was your first jam (it was mine too!). Your use of sound is on point, I think its spareness works in its favor (you can take advantage of a spare soundscape to make location-based sound/music even more meaningful by its absence from the rest of the game).
You have a solid foundation for an excellent game here. Keep up the good work!