I think you should make the circles not grayscale, add some color into it!
The background is a bit orange/yellow, you could add an orange color to the custom colors.
Normal
Tickrate 1
There are many spacing problems in this difficulty, you should go through the map and fix the spacing.
Combos get a bit high for the easiest difficulty, you should add more new combos
00:54:580 - These kind of sudden spacing changes are not a good idea for the easiest difficulty.
01:09:971 (1,2,3) - These kind of sliders are very confusing for a Normal
01:39:188 - Unexpected amount of repeats
02:11:275 - Very unexpected amount of repeats
02:30:840 - This slider doesn't make sense.
Hard
The slider velocity seems too slow, it heavily contrasts with the spacing.
There are many spacing problems in this difficulty, you should go through the map and fix the spacing.
darck360's Insane
Tickrate 1
01:20:666 - The repeat is pretty hidden by the previous hitburst.
Odaril pointed this out already, why didn't you fix it?
It's an okay map, the spacing is what's really hurting it right now.
The background is a bit orange/yellow, you could add an orange color to the custom colors.
Normal
Tickrate 1
There are many spacing problems in this difficulty, you should go through the map and fix the spacing.
Combos get a bit high for the easiest difficulty, you should add more new combos
00:54:580 - These kind of sudden spacing changes are not a good idea for the easiest difficulty.
01:09:971 (1,2,3) - These kind of sliders are very confusing for a Normal
01:39:188 - Unexpected amount of repeats
02:11:275 - Very unexpected amount of repeats
02:30:840 - This slider doesn't make sense.
Hard
The slider velocity seems too slow, it heavily contrasts with the spacing.
There are many spacing problems in this difficulty, you should go through the map and fix the spacing.
darck360's Insane
Tickrate 1
01:20:666 - The repeat is pretty hidden by the previous hitburst.
Odaril pointed this out already, why didn't you fix it?
It's an okay map, the spacing is what's really hurting it right now.