This game is very basic in controls, graphics, and concept, but everything is designed so flawlessly to make that a strength, not a weakness. Everything from how information is effectively communicated despite a two color pixel palette, to how the sound of your shots pitch shift up to naturally indicate how much ammo you have, to how the game naturally pushes you to continue through each level... it's obvious that the devs put a lot of love and skill into making this.
Should be noted that I bought this game on switch as well, so playtime is actually longer than steam says.