I have no idea what actually makes a good or a bad map, or how to make things flow well, so I'll just point out some things I found jarring.
holy shit it became a wall of text out of nowhere what the fuck happened
00:10:624 (8) -
This slider overlapping with the previous triple makes the pattern a bit of a clusterfuck and pretty uncomfortable to read. Maybe try moving it down a bit (and moving the next slider 00:10:760 (9) - up to keep it symmetrical if that's what you were going for with this.)
00:10:897 (1,2,3,4,5) -
This is good otherwise, but try making these patterns with the polygon circle tool to make them look a bit nicer.
00:14:715 (7,8,9,10,1) -
This is a lot better than the pattern I first pointed out, just pointing it out as an example of what I think you could go for with the first one
00:15:260 (1,2,3,4,5) -
These being stacked after the previous pattern being a widely spaced star pattern makes it feel a bit off to me. Maybe another similar pattern here?
00:17:442 (7) -
Combo here?
00:18:124 (1) -
Slider starting on 2/2 (red) and ending on 1/2 (white) often feels awkward. I'd generally avoid doing this unless the music heavily suggests a heavy hit on said 2/2. This is happening quite a bit in various places around the map, but I'll avoid repeating myself.
00:20:715 (7,8,9) -
This is a nice idea, but maybe try spacing the sliders out a bit more to improve readability. Also probably combo here.
00:29:306 (3,4,5,6,7) -
This would probably look nicer if you space it out a bit more.
00:55:897 (6) -
1/16 slider might be going overboard, try going with a 1/8 instead if possible.
01:18:533 (1,2,1,2,1,2,1,2) -
This pattern + the stream before it stack on top of eachother pretty poorly, try using more of the space around the stream/above the pattern to do something that's a bit less cluttered.
General stuff:
I pointed out a couple places where you could start new combos, but those weren't the only possible ones. Go through the map and check for spots where a new combo would make sense. Try to start combos generally on 1/1s (white ticks) and heavy hits. Don't be afraid of making combos that are just a few notes long, they can really make it easier to read and more pleasant to look at.
Overlapping patterns can work if they look nice, but there's times in this map where stuff is stacked on top of previous stuff for no particular reason, while there's plenty of completely empty space around it. Most of the patterns are nice, but try to look into uh... managing the space around the playfield? Some shit like that, I don't know.
Ok sorry if it sounds like I think I know shit about mapping, I assure you I don't. Implement what you want, disregard what you want. kthxbye