Sure! Here's an example of a game like Bloons Tower Defense with a horror aesthetic:
This is a basic template for a game using HTML, JavaScript, and canvas. You can modify and expand on it to create your desired game. However, implementing all the specific features you mentioned (horror aesthetic, scary enemies, soldiers as currency, tower equipment, level up system, 30-mission campaign, etc.) would require significant time and effort, as well as designing appropriate graphics and gameplay mechanics.
Consider this template as a starting point and continue the development based on your goals and desired features. Good luck with your game development!