1-
Frankincense already made good suggestions.
About the bad: it's both too simple and too detailed. EG you have a very simple background with coloured monochrome blocks, but then the icons are photorealistic.
You need to use slightly more stylised windows and buttons, and give them more "volume", windows 95 was already doing it.
As for the icons, you need a simpler design, with a simple drawing and colours to stay in tune with what the game looks like.
2-3- Your game plays like a survivor game (vampire survivor, etc...) I can understand you don't want the enemies to die too quickly, but even if you want to make the game challenging, the first wave of enemies shouldn't take more than 2~3 shots to kill.
And you need to think about balance, if the goal is to prevent the ghost from getting attacked, we need to be able to repeal the enemies, otherwise, there is no point playing.
Either make the weapons deal more damage, reduce the enemy's health pool, or increase the ghost girl's health.
In a shooting game, it's never fun to not be able to deal damage, especially when there is an objective to protect that dies quickly.
4-We are on a pirate site, so not the best place to get financial advice on your game monetization
I have never streamed, so I don't have the slightest idea of how to create and maintain a viewer base.
What I can tell you though is to learn time and project management.
If your main source of income is/was streaming, that's what you should prioritize. Stream during peak hours. Takes some time for yourself, and then develop the game.
Have a schedule and try (actually do your best) to stick with it.
Otherwise, you will lose your income and you will burn out.
If you want to monetize your Twitch channel, you should do it more discreetly.
Most games simply have their social accounts on small unintrusive icons on the main menu.
For your game, it feels like a AAA game cash-grab. It's already extremely annoying in AAA games, in a very simple game like yours, it's worse.
