@Yosniper, I'm actually going to be serious about my answer, with the engine the physics feel weird since everyone on the wannabes is completely adapted to Yutuu, Nekeron, Lemon, Seph engines, one of the main reasons everyone convinced HAGEOE to switch to Yutuu engine. These 4 engines are whats been used for an extremely long time, yet doing something as simple as a gate jump is like doing a diamond jump on the engine. (Might be pushing it a BIT far with that but you get the idea)
Also I don't know if you fixed the water but the water feels really clunky and your jump on it is really low, again this is mainly for the fact that everyone is adapted to Yutuu. I don't know if you fixed this or not, when you're on the ground in the water, your jump height is like jumping like you were on the moon, you jump pretty damn high. Anyway, the double jump in the water feels better if its the same height as a regular double jump if you were not in water, with the water as the way it is, doing something like this:
https://prntscr.com/47opo0 Would be quite a challenge.
Overall like sephalos said (A bit of a while ago) the engine has a few things going for it, however the reason why seph worked with your engine for 8bit is because he knew how to modify the engine and the physics feel a lot like yutuu and overall more enjoyable. This is really all i have to say about the engine, though there might be a little more, I hardly see any games with this engine, might be because its not on the wiki but i'm not sure.
I don't use game maker, so i never investigated the engine myself, HAGEOE is the only one who really compared the engines and made a forum post about it, which was really nice of him to do.
(Going slightly off topic) The thing that bothers me about this though and don't take this the wrong way i'm not trying to be an asshole, the post was on July 8th and you're just responding now because its been moved into game design, It wouldn't hurt or kill you to look on the other boards and go on twitch.tv sometimes you know, that's the way to find out what's going on, it's where everything happens, a lot of people have made this point and it is indeed very true, take this under consideration and if you want if you really want to be a part of this community, the forums don't really do the trick for you.