What a mysterious jogo. As has been said before, controls are fluid, which is a plus. But its an incomplete game, theres really too little here yet to appreciate or judge.

coisas essenciais: um fundo, uma delimitação decente daquele quadrado que vem rolando e algo que indique objetivos no jogo. Placas introduzindo experiências novas como a bola, o laser e as plataformas que somem, são usadas a tempos...

A física do jogo está muito boa, agora falta só o resto ;)

I hope by prototype you mean you intend to actually put some graphics work into this...That said, it was extremely basic, could use a batter background, some improved graphics, and a soundtrack to keep one interested. Didn't keep my attention very long, but might have with a few additions. Also would be nice to not always be thrust back to the start. Keep trying, you'll get there. On a positive note, this did not present me with any bugs that I noticed

Controls are smooth and that's all. Needs a lot of work.