Hi, please don't add duplicate and incomplete addresses like https://www.openstreetmap.org/node/12230507547. Also do not put outdoor_seating=no on objects like building where they do not make much sense.
The building does have 18 levels (you count the ground floor too in OSM into building:levels).
The position of the parkings at LIGET and parking roof are very imprecise. I am not sure which Ortofotomozaika you used, because the old one (2020) does not show the building yet, the new one (2023) would show you you have placed the objects wrongly. So that is weird. I will fix it, but please improve your process.

The grass areas at Topolcianska look right, but there is no real wild grassland in this area, it is all managed grass. See the description at https://wiki.openstreetmap.org/wiki/Tag:natural%3Dgrassland .
Also you should have connected the big grass area to the adjoining water polygon of Chorvátske rameno, as there is no gap between them (grass touches the water).