As a brief reason why these are not in separate "issues" is because most of these were too small to have as their own or hard to explain without the rest

Muse Dash features

Add the ability to swap the backdrop (either set by skin or chart haven't thought much on that yet)

Allow charts to be able to choose what backdrops to have at what moment just like how Muse Dash has in this chart here
https://youtu.be/hZJaT2gGnhA?si=B4MwMzSYzARRaSzT&t=98

Shader or FG image support

This can be found in a few charts and adds a small effect to gameplay I believe that this could have a really cool use in custom charts if executed right
https://youtu.be/hZJaT2gGnhA?si=B9__HeLMftKS2fYt&t=27

Add character falling after fail (Lowest priority possible)

Really small cosmetic item but could make the gamemode feel more complete
https://youtu.be/Vcg7u1MpLms?si=M1npPCfC2F0iKAR7&t=33

Change the stock theme in the dll to move the healthbar to a different location

Not much to explain here just move the healthbar below the fever meter to be closer to the actual game (could also make the fever meter smaller)

More to be added later as i find more

Other gimmicks or ideas

Allow the boss to be changed

To allow the boss activated by the chart to be changed via a theme or a loaded in chart theme

Rolls (ITG)

This is a gimmick that i feel could mix up the gameplay a bit im well aware that a system like this exists but that's for minibosses and they take up both lanes my idea would only take one lane similar to a hold and add combo per each press of a button during the duration of the roll (maybe add a bonus for high presses)

A slightly scuffed concept of what it could look like

Chart defined theme

This one pretty much explains itself its just a idea to allow custom charts to use their own theme (possibly add options for what elements the chart can overwrite like backgrounds, characters or the notes)

Beat based sprites

This is a small idea for if the theme chooses to do so instead of animating some elements based by time insteat its set to the current bpm of the song

More to be added later