How to beat the weekly challenge #4 in Retro tower defense solo

I joined the rtd update about 20 minutes late so the video had to come out later so sry about that. also because youtube's "checking" took dang 30 minutes Honestly this challenge was by far the easiest one probably because slingshotter carried, the only hard part was putting the trapperbot Discord link for the server (giveaways will be soon since the robux to the group is still pending for like 29 days):   / discord   the tags: #retrotowerdefense #rtd how to get the piano skin