I don't like how it scrolls down to the highest weapon you can use after you buy something.

I happen to buy a TON of Laser Cannons (they cost 100 coins and have 5 power, so they are the cheapest option for fusing, despite being time consuming to buy and fuse), and having to scroll back up each time is a pain. Just make it so the shop doesn't auto-scroll when you buy something.

Also, in the interest of making a useful suggestion, I think it'd be better if the shops were set up in a detailed list format. Have column 1 be the name, column 2 be the damage, etc. instead of having to mouse over the item to get it's details. Would make it a lot easier to compare things when deciding what to get for new gear. And if anyone is particularly attached to the current method, add an option to switch between the two views.

And maybe consider adding an item's power in with all the other details so you can see what it is before you buy it. It's not really necessary to know (and it might, for some weird reason, be a deliberate choice to not show it) but it just irks me.