#5. What would you suggest?
I think the flower should take like 2 hits, this early in the game that seams more reasonable. Also a lower initial force for the jump would increase the jump control, so hitting enemies in the air (as well as jumping platforms) becomes easier.
Not sure how movement is done when he moves so far with only a quick tap, it's like standing on ice. I don't recall, is there any acceleration or is it full move speed from start? If it goes up to max instantly and then apply a slide it would make sense. If that's the case then you should have him accelerate over a short time period (maybe 0.2 sec). Or shorten the slide based on how long the key is pressed. So many ways to code movement
#6. I've read this before a few times but so far no one has actually provided where and why the text is weird which makes it impossible to fix. So I'll have to wait until people point out the problem with this as I translated the text.
It's quite a bit of work to go through all the text and make suggestions.
#7. Hmm.. this is the first time I've read about this, the amulet is very cheap. I understand your frustration but don't really think it's a big issue however. Just my opinion.
The amulet is 20, I had 14. Running back to the beginning earned me 21 coins. So I killed every monster and destroyed every block twice and only got 21. Increasing the rate of coins before the shop would fix this. Or add a chest with some coins etc.
#9. I've told this to the dev' before. I don't think there should be any insta-death in the whole game. The best alternative would be to appear on the edge of the platform and losing health as opposed to dying. Apparently, this is very difficult to program, I couldn't tell you though.
It shouldn't be very difficult. I got it working in my game