Glue gunner is a good tower .. you can get to round 120 easily with ,village top 5, tack shooter top 5 and bottom 2, glue gunner bottom 5 mid. You can do the alchemist in the beginning with bottom 4 to create extra cash flow. Etienne is the hero I use for this set up. Make sure you get the tack shooter to top 4 before 40.
Be careful on some maps, regrow balloons with the glue gunner with bottom 5 and mid 2 w/ alchemist bottom 4 will soft lock the 🎈 in the spawning area and it will gain the layer back and the be pushed back and just loops. A village mid tier will fix it ( just make sure the tower is near the spawn).
It's a really fun, addictive game. I hope we get paragons for all the towers before they shut it down. I've been playing over a year.