as you may know, im only 15, and have been mixing only for 3 months or so. around 1 minute, you have done a common thing, before the beat drops you looped the song, then looped it to a shorter count, then a even shorter count (someone with a bit more knowledge may correct me cuz there may be a name for that i do not know of), then im guessing you hopped to a cue point at the drop. As fun as it is, and as often as you hear it, you dont wanna over use it, and when you do you wanna do it correctly.
and then as tommy said, your rockin the double beats, that just is fixed by beatmatching correctly
when doing transitions, dont randomly bring in track b halfway through track a. you wanna mix songs smoothly. since im new im not an expert on transitions yet, but some good ways to transition are mixing track a’s breakdown with track b’s breakdown, or mixing track a’s outro with track b’s intro. those are very simple transitions and as long as you practice those you will find yourself learning new transitions and techniques to mixing songs together.
at 3:35 it sounded a bit awkward when the song dropped
you also wanna make sure the songs are in the right key to mix, you can check your songs key by getting mixed in key, a lot more helpful because transitions will sound more fluent.
watching tutorials, and surfing the web helps quite a bit. and listening to recorded mixes from artists is really helpful if you can pick out what they are doing when mixing.
hope this helped a little