Thank you for such details!
About ammo on normal, yep I will keep testing ammo resources in different difficulty mode to make it more balanced. :)
Thank you for your praise of the katanas, the next test will open the weapon upgrade system, and some weapons can get the alt_attack mode by upgrading.
Dash is a very important skill in HH, because many enemies in HH are very high speed (especially above hard difficulty), dash is a very good ability to stay away from enemies or to get closer to the enemies killed or dodge Projectile. Above HARD difficulty, the dash is very useful for dealing with enemies that have a lot of melee damage, and the cooling time is not long. When you are used to using dashes, you will find it very very sweet :)
The spider is really a headache, and you will get a new weapon in the next level, which is very useful for dealing with spiders. The katanas are also one of the best weapons to kill spiders, because the melee attack of the katanas is an AOE attack :) You guessed it, there is indeed a huge version of the next level. : D
In fact, I haven't started to deal with the optimization problem yet. Sorry about the low fps. Thank you for reminding me! The overall optimization of the display will start in due course.
Thanks again for such detailed feedback!