thank you for your comment :) like I mentioned in the end credits scene unfortunately I had only 2 free days so I didn't have a lot of time and it was really rushed. The original plan was to make it a rougelite game where you can buy upgrade cards after each run. And hold to shoot was one of the upgrades in the original plan.. but yeah at the end it was scrapped completely because of the time I had.
And about browser games. I'm an unreal engine developer. Unfortunately there is not option to create browser games in unreal, one of the only downsides of the engine