[Easy]00:41:948 - 1 is too close to the previous slider.
[Normal]01:57:698 - Use a repeating slider instead of triplets to make it easier.
02:17:948 - 1 and 3 are too close to 2 imo. May be confusing.
[Hard]02:41:573 - Move the 4 farther from the 3, or make a new combo on 4.
02:53:573 - Same as above.
02:47:573 - New combo
02:47:948 - Remove old combo
Please note that these are just suggestions. Overall the map is fine, you might use some custom combo colours.