This certainly isn't a bad game. It's a very competent point-and-click game with pretty decent graphics. The problem is that I already played this game eight years ago. Played the shit out of it, in fact. Aside from some odd easter eggs, there's pretty much zero new content. If you've played Pico's School, you've played this. All it really is a re-release with updated graphics. Now, I'd be even more upset about that if professional game companies weren't guilty of doing the same thing. (Stay classy, Nintendo.)
I guess a lot of people are happy to play the same games over and over again so long as the graphics are shiny and new, but I'm not one of those people. I'm not saying I hated it, but I didn't really liked it either. It's a "3" but a soft 3. I don't want you to read this and feel disparaged, because this game is very competent. It's undeniably well made, it's just that it doesn't really offer anything new. When I play a game like this, I think "why do we need it?" It's sort of like the Robocop Remake or one of those
Here's some advice if you ever do something like this again: the smallest improvement or change can push something like this over the edge. Like take the other Pico's School remake floating around. That had full WSAD movement and better gunplay. I'm not saying you have to make a completely new game or rewrite the engine/mechanics, but some extra content would make a world of difference. How about some extra rooms? Or a new boss? Or a new puzzle?
Better yet: you clearly have all the mechanics down, you understand how they all function and work. Why not just take this simple engine and these simple mechanics and make an entirely new game out of it? I'd love to see an entirely new game "in the style" of Pico's School.