Suppressors are a bit bugged out, they are not actually doing much in the way of supressing the audio outside of the sound the gun makes, and making them look cooler. Most ai can basically laser beam you in a millisecond of sight even at extremely long range... They will be fixed and have more uses later. I do know the 9mm pistol supressor is currently an absolute unit. that will be fixed in the first update.
grips do not currently do much as well, shotgun choke does affect spread greatly especially with ADS.
Optics are all mostly working. Guns do jitter around a lot while moving due to a frame pacing and coordinate issue.
Spiders are lame, they exist only to give you ammo and credits and to keep you on your toes. They will be improved in the first major update greatly. They are procedurally animated using sine waves.
If you make it to level 2 and beyond and things are a bit wonky I know. I have been building the editor and ingame tools to observe any level I wish to for debugging reasons. Currently there are 3 enemies in a preview state, the juggernaut, the lurker, and the meditator. These will change in behavior, appearance, capability, and visual by the first major update.
Occasionally there will be gaps in the tiles of the level generation. This is not intended. Occasionally spiders fall through the map into the unplayable area, occasionally spiders will push the player out of bounds and ruin your run. These issues will be resolved.