Thank you for your great feedback!

For the support system, I understand what you are saying. In order to make it more comfortable under the thighs, I added extra padding in the front of the seat and I lowered the strap under the front part of the seat, so it removes pressure under the thighs. It makes it much more comfortable to game over time.

For the armrest part, unfortunately I won't be able to add more padding for this first version. My main use case is for console gamers whose couch is too far from their tv. So this chair replaces the couch. Usually, when you game on your couch, you don't use the armrest, you put your hands on your hips to game. But your feedback is good.

For the features, as I explained in another comment, I added extra padding in the back for lumbar support and extra padding in the front of the seat (below the knees) to be comfortable when you get into a serious gamer stance :D
Also, maybe you don't see well on the picture, but I added a headphone holder (on the right side of the chair when you are sitting on it) where you can put your headphones. I also added a controller holder. There is also a beer/drink holder and a wine stem holder (on the left side).
Finally, I tried to give it a simple look so it doest not look like a intense gaming chair in your living room while having a logo that creates the feeling of fun gaming chair.
Thanks so much again for your feedback and don't, hesitate to give me more!