This is the first change I find I need to throw my voice out there with.
This game already has a very limited community of artists and animators. This game's look and feel DEPENDS on those artists. The new system will only allow for basic shapes? Get real. We already have a 50kb limit which is outrageous for more complex SVG, but we deal with it. Effectively banning HTML isn't about performance. It's about censorship.
This is one excuse I can't believe based on how long lights perform. You want to increase performance? Fix the lights. You want to lose your game's aest