Comment by dxuh
I think putting off polish for later as the OP and multiple comments here recommend is a fallacy. There are many popular, successful games that would just not be fun if they didn't have good animations, no effects and everything was boxes. Every game that relies on "feeling good to play". It might be fine for an RPG or an RTS, but it's probably not for something like Overwatch or Doom (the new ones). Just imagine Vampire Survivors without sound or effects. Some games live off the art style alone. This is a very controversional opinion, but I think if e.g. Ori and the Blind Forest had bad art, no one would have played the game. Some games you can evaluate really well with bad art and no juice or polish, other games need some and there are even games that need a lot of it, before you know if they can be fun. It's not that simple imho. I remember working on games that were not really fun until I added some effect and suddenly it was really addicting. People like flashing lights and noises and pretty pictures. If good, unique or interesting art was irrelevant, no one would invest in it, but people do.
> Just imagine Vampire Survivors without sound or effects.
I can't help but feel that this completely undermines your point - Vampire Survivors is bashed together using rudimentary knockoffs of sprites from games from the 1990s, in an engine which barely supports the idea of particles let alone proper visual effects.* It is the gameplay that carries Vampire Survivors, not the aesthetic.
Game feel is of course essential to producing a good game all-round, but a competent game designer can and will tell the difference between a good game design and a bad one, way before polish and juice are layered on top.
*I don't say this as a criticism - Vampire Survivors is fantastic - but the idea that it's propped up by its look is just daft.