Thank you very much! :D I feel like I could still improve so much...
I've used 16x16 for the single sprites, the dedicated video resolutiuon is 384x216 which is than upscaled to upper 16:9 resolutions like 1920x1080
Ah i see. The background really caught my eye so that was what i was asking about specifically. Thank you for the answer. :)
The background Images are all in 16x16 style but the files itself are 576x216 so tiling doesn't make it that obvious, that they are repetitive :D