this game is really fun I had a lot of joy playing it but especially the last 2 levels were so hard to finish without using a bug: you can jump again after touching some walls corners (Ithink it's below your gun) and this also applies to lasers you shoot so you can jump shoot then touch the laser and jump again this is really fun though it's kind of hard to master but it makes the game more enjoyable I think. not all walls are like those by the way in the 7th level from the left side of the gem containing wall you can't ledge hop but from the right side you can.
after I found laser hopping (the technique I described earlier) I felt like my eyes opened up and I discovered a new way to play the game. in the menu screen you can jump infinitely with laser hopping but you don't have infinite bullets normally so it shouldn't be a big game breaking peoblem.
my only issue with this game is how short it is because after I learned laser hopping I thought I could explore new things that you didn't intend but there wasn't enough stuff to keep playing for longer.
so it's really good here's my rating: -shorter than desirable +laser hopping +-kinda buggy but I like it that way 8/10