I got a chance to play this, I really like the style! It reminds me of NES games. character design is also really good, Cuadrado is a lovable little cube. I liked the air control of the jump so I get what you are saying about wanting to hold onto that even if you change the jump in other ways. the colliders around the spikes seemed to register a hit with my character early so sometimes it felt like they were getting me early, but that could be the animation playing tricks on me. Overall, really like what you've got here and eager to see where you go with it, let's keep developing these and make them even better!