:D 1) There is already a check point on 1-4. When you die, you start again in the start of 1-4. The green tripoids you said, in fact are not so hard. If I do easy basic enemies, then ... I will not be comfortable with the dificulty of the game. Trust me, try to see how to beat em, are relative ease. I dont want to do that kind of games of "play for play", better "analize the enemy and act". I tested a lot the mines position too, and I will not put something impossible for the players. For this game, players needs to have better reflects than other easy plataformer games. Reflects like a ninja! ¡wua! ¡zzzZA!
2) I dont understand your second point. "more clear means to heal the character"? What do you mean? There is a few items that recover life, but I dont want to put many, becouse that would be easier the game.
3) You mean attack in up direction too? Yes, I planned that so, but it would be a little more complicated the code. I will do a "sit down" attack, but not a "down" direction attack. I dont want to complicate to many the code.
This is not a nsfw game, so, I dont understand why that age restriction XD
Remember: this is not a game like Hollow Knight, Celeste, Blasphemous (even that it so easy), Guacamelee, ... This is a game like Ninja Gaiden.
Thanks for play!