Hello !!
Thanks a lot for your feedback !
Maybe make the hp meter with traditional hearts.
And a bit of explanation the first time you launch the game might not hurt and maybe help wit understanding the lanes. Not sure how to make it visually more impactful.. more particles when you shoot maybe ? More recoil ? Changing the sound could help as well.. I'll think about this
As for the enemies, do you know which ones ? Where they chasing you, too numerous, too much hp, or coming off screen ? I am having a hard time balancing, some find it too hard, others too difficult, I'm counting on the meta-progression to help with that.