Thanks for your review! All your reported issues are already being fixed. As for your questions:
1. Yes, there will be a mod menu like thing inside the new sandbox mode.
2. If you mean the e coin you use to purchase skins, then no. It will only include gameplay tweaks. If you want unlimited e coin though, you can try putting the code 8888 in where you put mission codes, hit Start and check your balance.
3. Yes. You can expect a new, unique boss.
4.Probably September 9th or 10 th.
5. Adding new finishers is kinda complicated and honestly speaking I know close to nothing about animating stuff yet, so that could be difficult.