The game feels like it is still in alpha testing and was made before Sword and Shield.
The mini map is trash since it lets you vaguely know what may be in your area, but those Pokemon may not have even spawned in yet.
The graphics are bad, and there is a lot for frame skipping whenever you move. The windwills and npc movements are jittery at best.
The shiny appearance is shown up on spawn, but there is no indication other than color that is is shiny, even after capture. There are not shiny sounds like in Arceus when they spawn on the map. Also, because the graphics are so bad, discerning the shiny version of some species is very difficult.