a good site overall but a little boring from the design
It depends on each player perspective as Rollbit interface is liked by many with dark mode theme and easy to navigate interface but the main thing should be casino should be legit and games should be fun and exciting for me personally and it's good you liked the site and some new development can improve interface more.
The design is not my priority though, but of course some gamblers wants to play on a more entertaining graphics and with that Rollbit might not be the option but aside from this, everything works well for me. Maybe this can be a good update for Rollbit in the future and require their game provider to update their graphics. Rollbit is still growing, this comment might get the attention to the team and might encourage them to get some updates.
I also like the dark design of Rollbit and even in other casinos, I always set the theme into a night mode (if there's an option) because I don't like playing in too bright. But we really have different preference when it comes to design hence it's understandable if some gamblers might find it boring. Well, it's not the main reason on why we chose to gamble in the particular site, but we know it's one of the important part to work on. Since it can attract and encourage the gamblers to play longer.
Anyway Rollbit is open for suggestions thus if the gambler raise this feedback to them they will certainly do something to improve it in the future.