I DO listen!! You have no idea how much I appreciate your comments! I'm aware there's a lot to polish, and one of my intentions posting it here was precisely to get feedback like this
Yes it is my first game @@ also I don't have much spare time from work, so I'm a little slow. However I will take notes of each one of the things you mentioned and work on them over the weekend. I'm planning to slowly introduce more mechanics, characters, levels and enemies so keep an eye out for that!
About 2: Flip blocks are meant to work that way, I think it steps up the difficulty a bit, but I've also considered refreshing them (they worked like that originally, in Mario)
3. A friend also mentioned the collision thing, and I already have a solution I'm implementing right now!
Again I thank you for your feedback, friend. I'll let you know when I update the game if you feel like playing some more!