Great game, can be a bit painful at times, there should be a difficulty setting along with other modifiers and stuff, I love Toontown and have so many ideas for Toontown, including Grindworks, I'd write more about each idea but I'm a bit tired and lazy at the moment to write about every single one, although some main things I want are:

• Seasonal events, possible new Toons for holidays, maybe just a reskin or maybe even new bosses, although I don't know how this would be possible because I don't think the game knows the date because it's offline.
• Improved cog creator, where you can choose what status effects, damage multipliers, health multipliers, cheats, stats, ect. your cog can have.
• Floor/Room creator featuring a collab with Toontown Realms, possibly? So the prop generator and magic words can be ported onto Grindworks for the room creator. So you can make a custom room that can appear in your custom floor. And with that collab, Realms could also get the cog creator.
• Easter egg seeds, such as "givemetheworks" or "theworks" that would initiate a secret hard mode playthrough, with harder bosses, boss rush final floor, ect.
• Probably more? Can't think of more of the top of my head at the moment. 

TL;DR

Great game with a few problems, overall good though. 4/5 stars.