in this post, ill try and fully explain my thoughts, i was tired when writing it originally:
Upgrades/ability items:
The items in this game are extremely unbalanced, and for the most part, you only want a certain few, as they're way more useful than others.
Double jump: a good early game item which become fairly useless later, its main use (for me) was to be paired with parachute for larger gaps. it can also be used to climb up areas usually only accessible with hook gun, but wall jump is also needed for this.
this is a fairly useless item without other items, and also gets overshadowed by those other items.
Parachute: an all round good item, also best when paired with others. it overshadows wall grip entirely, as it works anywhere, including walls. i found the best places to use this were if there was a large drop, or i wanted to make it across a large gap early game. its very useful when combo-ed with double jump, and can be used all throughout the game, also making double jump a somewhat good item.
Wall jump: an amazing item to get early game, lets you climb any height with a wall near it, and i believe its faster than hook gun. also best combo-ed with double jump and parachute, letting you make the longest jump possible without hook (so jump)
Wall grip: good for stopping yourself from fall damage without parachute, once you get parachute its literally useless.
Hook gun: I've talked only good about this so far, and yes, i believe its the most OP item in the entire game, as well as the buggiest. you can climb upwards almost anywhere, as well as go horizontally for an infinite amount of time in air. The item also sometimes hooks in weird spots (especially when in water). the only other bug i know lets you clip through any ground beneath you, making it OP. my favorite by far.
Flippers: while the water items and climbing belt are the worst items in the game as they're too situational, the water items are better due to being the only things that work in water, so they're automatically useful.
Water tank: they buff flippers, that's all i'm gonna say
Climbing belt: easily the worst in the game, only some rooms even have climb-able surfaces, but usually they can be avoided, and 100 can be if you have hook gun.
Ancient maze scroll: I don't exactly know what it does, but I believe it shows you how to get items (or the way to go) or where you've been.
Postcard: Bring you to mount hop, of course its useful.
Those are how i feel about all of the items, and the balancing.
I will post more another time, i have alot more i want to say
