Very cool game! I really enjoyed it until finishing the boss, which felt very satisfying... The only complaints I really have are the spin sounds being too annoying and repetitive, the controls maybe use shift for sprinting, and the theme not really applying to the game. The music was great, especially the implementation of flight of the bumblebee in the bossfight, sounds amazing. The artstyle maybe needs a bit of work but it still delivers that retro mario look... The lore wasn't that bad, I also like the scrolling format of the beggining and the fact that you can speed it up... The level select UI was also well done, where it shows the summary of the level completion and smoothly moves along the levels, but maybe there should be a better indication that the next levels were locked, because I actually thought I was already in the game and tried moving but can't XD. The jumping and spinning were well-implemented. I also like how in level 1, you intentionally didn't give the player an idea of how to get to the secret, and in level 2, you show that you can sprint while jumping to spin by using these very well placed mushrooms that you bounce off of... That's great level design. The boss battle was also very polished... A good set of moves where the more you play, the more you find out how to beat it, where at first, I thought it was really hard, but after figuring out the pattern, it became too easy... That's also great boss design, and adding a boss death scene was very satisfying... Overall really good game, very much enjoyed it!