Thank you so much for your comment and appreciation. Yes, we have a list of small changes to make after the Game Jam, and we are also going to implement hotkeys 1-3 to change weapons. Regarding the scrolling direction, there was a debate within the team. Some teammates felt it was more intuitive to change weapons by scrolling down, but when we looked at other games like Vampire Survivor, they scroll up!
About the weapons, you need to fill the blue bar to get upgrades. In the upgrades, you get more damage, ability haste, and boot speed. Each time you upgrade your ability haste, your weapons acquire fun characteristics. Thank you so much for taking the time to provide your feedback. Again, good game! I hope you get more visibility because it is a very good but underrated game. Good luck!