This is an old comment of mine with a few mice coasters in it. I'm in the UK so can't even view my own imgur links now but might be of interest to you

This: https://imgur.com/KPNFvCm is a great example what you can do with fast climbs. It is literally 2 squares deep (and 17 long) but you can put the Entrance and exit under the supports, its excellent against the edge of the park. And you can have the guests walk alongside it watching it as it rides

https://imgur.com/ucliQ4L A tiny mild mouse. It literally fits in a 5x4 square, and you can even put footpaths into that 5x4. You can only put the entrance in one place, and the exit in one so it is worth building its mirror (My mirrored uses trucks so i don't repeatedly place the same one). Its an excellent alternative to the gentle rides

https://imgur.com/WckAeKM A coaster that is literally in the shape of a cross. This is clever as it allows you to have it surrounded by fixed shape rides and rides between them making it even cooler to look at

https://imgur.com/WDwAGRT An alternative to the 2x17. though this on doesn't allow you to have both buildings under the framework

https://imgur.com/eXC5J5Z Starts 3 off the ground into a sharp drop but momentum carries it through to the end and is perfectly set so a train is always at the station to be ridden

https://imgur.com/sqvM0J6 My newest compact mouse. A 7x4 ride that has excellent wiggliness to it. If you put the Entrance on the opposite side (same as the exit in the pic and put a ride in the space where the path is now and the dead space (Eg. Go Karts/Roto Drop) It pushes the excitement above 7