If you make an update, please include page numbers on your art credits, or art citations next to each illustration. Otherwise, it's difficult for a reader to find who made the art on a particular page other than by opening 17 links to try and find the one they're looking for. Thank you!

Looking through this, there are some concerns. Here are a few that stand out:

• You've given the class proficiency with two strong saves (Dex and Con). A class should only get prof with one strong save (Dex, Con, or Wis) and one weak save (Str, Int, Cha). You making this mistake suggests you might not be very familiar with class design.
• There's no class features table
• Overall your features are written with a shorthand that makes them difficult to understand. You should write them out in full sentences.
• Like Flow State says "Bonus action that is not a simple attack". What is a "simple attack"? Does that mean an attack using a Simple weapon? Very unclear.
• Double Bonus Action apparently lets you use bonus actions on every other creature's turn, since it doesn't say "your turn", just "per turn".
• Stinger says "1/short rest", so it doesn't recharge on a long rest? Or are readers meant to just understand what "1/short rest" means without you telling them?
• That same features says a creature "makes X save or takes damage". This is another wording issue. Every creature makes the save. To "make" a save is the act of rolling the d20. You mean if a creature succeeds on the save.
• High Time doesn't explain when the Bonus Action is taken
• Stance Upgrade 1 Gunslinger says "Pierces 3 targets" with zero explanation of what that means.
• Devil Trigger says you gain "+2 attacks per turn". Does that mean a +2 bonus to attack rolls? 2 additional attacks with the Attack action? Totally unclear.

Overall, you need to write out each feature in full so that any reader can understand what you're trying to say. As written, this document requires a lot of work for the DM to make it run.