I finally found some time to design and release a new version - Pininja Pixel
pininja_pixel_premium_t (resized).jpg
This is a Premium 100% cotton T-shirt (just the shirt costs 15.40 EUR) that's why the price is set to 19 EUR.
The V-neck one is 15 EUR and Hoodie is 25 EUR (so the profit is very low, just to get them printed)