hitsounding - w/e. not gonna argue about this, customs are nice additions, defaults are fine too.
playability - just being able to play something does not imply that opinions are valid or invalid. experienced mappers who have many ranked sets or spent a lot of time in editor analyzing maps can definitely find concerns without "being able to play the map." the "elo" you are looking for in this type of discussion is not playing skill but rather mapping and analysis skill, which is separate from that.
regarding the map -
i think i agree on some of the 1/4 jump things, stuff like 00:49:919 (1,2) - feels quite awkward to play due to the movement needed, while others like 00:49:221 (1,2) - lead into each other and are much more comfortable.
i think screen use can also be a bit better, but that's not really a huge deal imo. it doesn't feel particularly awful to me anyway...
biggest issue imo is aesthetics and organization of patterns, things like 00:22:351 (1,2,3,4,1) - which uses different angles looks weird even though there's a clear purpose for the different angles. i think it makes it look really rigid and strange. the jump patterns like 01:02:302 (1,2,1,2,1,2,1,2,1,2,1,2,1,2) - also play a bit oddly due to different angles between the jumps that seem to not be organized in a logical way - there is a downwards progression but spacing goes up, and the angle between things are quite weird...
01:05:616 (3) - this is also comboed inconsistently btw lol
01:26:253 (1,2,3) - this pattern ends up playing pretty weakly because the player will just stop halfway through the 1 slider and go to 2. moving 2 down like
http://osu.ppy.sh/ss/10865379 would be better in terms of making the player actually follow 1 slider.
01:36:370 (2,3,4) - i do think these triples are pretty awkward, they don't sound supported and white-red is pretty weird to play imo. better to just use a slider maybe?
01:49:277 (1,2,3,4) - this angle is really strange to play, mostly cuz it's wide angle and the rest are sharp angles
01:54:945 - skipping that =(
anyway i dont think the issues are really as serious as ayyri thinks, but there is still room for improvement. there is a lot of logic to the patterns but imo it lacks cohesion in terms of how those patterns play, which just needs practice...