I give it a 5/5 because while it is a good side scrolling system, you should have just put the tut. straight out there. P.S I'm pretty much only giving it a 5/5 so hopefully you can give it a proper tutorial.
Those were possibly THE BEST GRAPHICS I HAVE EVER SEEN. I hope you are being payed because its rich colours and grahics like that that we gamers crave.
I don't know if this is a glitch or not but you can wall jump up a single wall just by moving towardss it while jumping, this makes alot of the levels easy.
Fantastic game I gave it a 5/5
If I could suggest something, I would say that when you upgrade the engine, you also upgraded the shape of the ship to increase aerodynamicy, I didn't like being a floating cube.
Other than that, fantastic.
This was really helpful for me, it's a good slingshot and can lift heavy weights when you add motors.
http://FantasticContraption.com/?designId=2572758