Finishing this was quite a challenge. Some sections are quite hard, and could have used some more checkpoints. I found the introduction of new elements was quite good and made for interesting new challenges.
But I think it’s quite counter intuitive that you can shoot through the boxes for the checkpoints, especially because the bullets are barely visible. (With that kind of bullets i would maybe leave a trail displaying their path behind for a short while) And especially the final level was very confusing because enemies would just run through the boxes while you can’t or can shoot through them (i still haven’t figured it out), and the final challenge presented felt quite unsatisfying (compared to the levels before which felt quite satisfying on completion).
Also i would really use a ground and/or wall textures, especially when using moving lasers, since you lose track on the player position is space if your eye has nothing to orient itself on.