What's a good Android game for real-time strategy with tower defense and no in-game ads?

Inkvasion is a real-time strategy game that blends tower defense elements with a campaign mode, providing a solid option for players seeking engaging tactical gameplay without intrusive ads. The game stands out with its unique hand-drawn art style, which adds a fresh visual appeal compared to typical strategy titles. Players can build bases, manage resources, and deploy units in fast-paced scenarios that require quick decision-making. Reviews indicate the absence of advertisements and no requirement for high-end device specs, which enhances accessibility for a broader audience. However, some users report persistent issues with the co-op multiplayer mode, such as difficulties joining rooms or receiving invitations, which can hinder the social experience. Despite this, the single-player campaign and core RTS mechanics receive consistent praise for their depth and replayability. For anyone looking to dive into strategy games with a focus on defense and resource management, Inkvasion delivers a reliable and cost-free entry point, though potential multiplayer improvements could elevate it further.